diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index 50a6ecd7..1169d5ee 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -141,13 +141,64 @@ class Database {
         return this.db.dictionaries.toArray();
     }
 
-    deleteDictionary(title) {
+    deleteDictionary(title, callback) {
         if (this.db === null) {
             return Promise.reject('database not initialized');
         }
 
-        return this.db.terms.where('dictionary').equals(title).delete().then(() => {
-            return this.db.kanji.where('dictionary').equals(title).delete();
+        this.db.dictionaries.where('title').equals(title).first(info => {
+            if (!info) {
+                return;
+            }
+
+            let termCounter = Promise.resolve(0);
+            if (info.hasTerms) {
+                termCounter = this.db.terms.where('dictionary').equals(title).count();
+            }
+
+            let kanjiCounter = Promise.resolve(0);
+            if (info.hasKanji) {
+                kanjiCounter = this.db.kanji.where('dictionary').equals(title).count();
+            }
+
+            return Promise.all([termCounter, kanjiCounter]).then(([termCount, kanjiCount]) => {
+                const totalCount = termCount + kanjiCount;
+                let deletedCount = 0;
+
+                let termDeleter = Promise.resolve();
+                if (info.hasTerms) {
+                    termDeleter = () => {
+                        this.db.terms.where('dictionary').equals(title).limit(1000).delete(count => {
+                            if (count > 0) {
+                                return termDeleter();
+                            } else {
+                                deletedCount += count;
+                                if (callback) {
+                                    callback(deletedCount / totalCount);
+                                }
+                            }
+                        });
+                    };
+                }
+
+                let kanjiDeleter = Promise.resolve();
+                if (info.hasKanji) {
+                    kanjiDeleter = () => {
+                        this.db.terms.where('dictionary').equals(title).limit(1000).delete(count => {
+                            if (count > 0) {
+                                return kanjiDeleter();
+                            } else {
+                                deletedCount += count;
+                                if (callback) {
+                                    callback(deletedCount / totalCount);
+                                }
+                            }
+                        });
+                    };
+                }
+
+                return Promise.all([termDeleter, kanjiDeleter]);
+            });
         }).then(() => {
             return this.db.entities.where('dictionary').equals(title).delete();
         }).then(() => {